Sunday

January 22, 2017
Total # Posts: 337

**college chemistry**

calculate the average kinetic energies of CH4 and N2 molecules at 273k and 546k

*January 20, 2015*

**Math**

Points P and Q are tries toom points on segment AB. If AQ =7x+6 and PQ= 3x+5, find all possible values for the length of AB. So far I've established that 4x+1 is the length of AP and QB So the total length of AB should be 11x+7 I think, I'm not sure how to solve and ...

*January 8, 2015*

**CHEMISTRY-URGENT**

Thank you very much!!

*January 6, 2015*

**CHEMISTRY-URGENT**

A 4.43 gram sample of phosphorus was burned in air to produce 10.15 g of an oxide. What's the empirical formula of this compound?

*January 6, 2015*

**language arts**

Well for question 3 if we take the word nonchalant, what does it mean? Then go from there.

*December 10, 2014*

**physics**

There are 4 significant figures.

*December 5, 2014*

**chemistry-URGENT**

how many moles of atoms are contained in 7.654 x 10^32 atoms of Ga ? Thank you!

*December 2, 2014*

**Chemistry**

How many moles of atoms are contained in 5.60 grams of Sulfur? Can someone help me understand how to work out other problems like these as well? Thank you!!

*December 2, 2014*

**Math**

Larry and Gary are discussing whose garden has the most area to plant flowers. Larry claims that all they have to do is walk around the two gardens to get the perimeter and the one with the greatest perimeter has the greatest area. How would you help these students?

*October 14, 2014*

**3 grade math**

How can I find the area of an angle?" How do you respond?

*October 14, 2014*

**physics**

Jordan throws a golfball straight up from the top of a building 50 meters high. The initial speed of the golfball is 20 m/s and it just misses the edge of the roof when it eventually falls. Neglecting air resistance, find the velocity of the golfball just at the instant it ...

*October 12, 2014*

**Chemistry URGENT!!**

Which anions have the largest and smallest radii? Thank you!!

*October 10, 2014*

**Chemistry**

Which positive ion (cation) has the smallest radius? Please help! Thanks!

*October 10, 2014*

**Math**

For how many values of n where n is a positive integer less than 10 is n+1/2 an integer? A) None B) One C) Three D) Four E) Five Please I would like some help explaining how to get the answer :)

*September 24, 2014*

**CHEMISTRY**

Hi! I know I asked this before, but I still don't understand how to solve the problem:"Since a hydrogen atom consists of one proton and one electron, it should have a mass of 1.763 x 10^-24 grams. Using unit factoring, calculate how may hydrogen atoms you'd have ...

*September 18, 2014*

**math**

54 seconds

*September 18, 2014*

**Chemistry**

could you clarify what you mean by this answer? I was confused. Thank you! :)

*September 18, 2014*

**Chemistry**

Since a hydrogen atom consists of one proton and one electron, it should have a mass of 1.763 x 10^-24 grams. Using unit factoring, calculate how may hydrogen atoms you'd have if you had 5.6 g of hydrogen. Thank you!

*September 18, 2014*

**english**

You should either put a period after the word purchase and make two separate sentences, or you should make the statement read, "While at home, I regretted the expensive purchase, so I vowed to return one of the sweaters." Hope this helps! :)

*September 18, 2014*

**math**

You would pay one dollar in sales tax. You can find this out by multiplying 16 times 1/16, thus finding 1/16 OF 16 dollars.

*September 18, 2014*

**Chemistry**

A metal bar having a mass of 212 g is heated to 125.0°C and then dropped into 375 g of water at 24°C. After a while the temperature of the water and the metal is 34.2°C. If the specific heat of the metal is 0.831 J/g°C, how much heat did the metal lose? Please ...

*September 13, 2014*

**Chemistry**

Thank you so much!!

*September 13, 2014*

**science**

Cuz i'm cool is right with everything except 1 is C. Thank you I needed to check over my answers and you helped a bunch!

*May 8, 2014*

**Grammar: PLEASE HELP**

What's the difference among a simple sentence, complex, compound, and compound-complex. I always have a difficult time knowing which is which, except simple sentence of course, that one is easy

*May 7, 2014*

**chemistry**

Can CoBr2+ NH4Br + NH4OH ---> Co^2+ (aq) + 2NH3 (l) + H^+ (aq) + H2O (l) + 3Br^- form the complex [Co(NH3)5Br]Br2 if so please explain

*May 4, 2014*

**CORE MATHS**

The first two terms in the expansion of (1+ax/2)^10 + (1+bx)^10 in ascending powers of x., are 2 and 90x^2 Given that a is less than b find the values of the constants a and b . (11 marks) Thanks :)

*March 20, 2014*

**Algebra**

If you add them this is what you get: 3.1x^2+6x+0.3 4.2x2-5.2x+1 ---------------------- 7.3x^2+0.8x+1.3

*March 7, 2014*

**algebra**

Damon and Connections Academy are 4/4 100% correct!Thank you I was reviewing.

*February 4, 2014*

**algebra**

Cuz im cool, that is so true!

*February 4, 2014*

**English**

Hello, what is a common theme between the Shakespeare's Romeo and Juliet, To Kill a Mockingbird, and Roahl Dahl's Lamb to the Slaughter? Please give examples of the the theme found within in the 3 books. It's just that I have to write a formal literary essay ...

*December 10, 2013*

**chemistry**

Complete the following fission reaction 1n0 + 235U92 → 131Sn50 + ? + 2 1n0 + energy

*December 6, 2013*

**chemistry**

Complete the following fission reaction 1n0 + 235U92 → 131Sn50 + ? + 2 1n0 + energy

*December 6, 2013*

**chemistry**

Hello ellie again. I am still having trouble understanding bombardment. The question I'm working on says Complete the bombardment reaction ? + 40-18Ar → 43-19K + 1-1H

*December 5, 2013*

**chemistry**

Hello this is ellie again. I was wondering could you explain what a bombardment reaction is and and show an example of it? Thanks

*December 5, 2013*

**chemistry**

I am having trouble understanding what the concept is for writing these out. Write a balanced nuclear equation for the alpha decay of each of the following radioactive isotopes: curium-243, 22589Ac

*December 5, 2013*

**chemistry**

hello this is ellie again. I need help on this one problem A solution of 0.314M KOH is used to neutralize 10.0mL H3PO4 solution. H3PO4(aq) + 3KOH(aq) → K3PO4(aq) + 3H2O(l) If 29.3mL KOH solution is required to reach the endpoint, what is the molarity of the H3PO4 ...

*December 3, 2013*

**chemistry**

A solution of 0.314M KOH is used to neutralize 10.0mL H3PO4 solution. H3PO4(aq) + 3KOH(aq) → K3PO4(aq) + 3H2O(lIf 29.3mL KOH solution is required to reach the endpoint, what is the molarity of the H3PO4 solution?)

*December 3, 2013*

**chemistry**

A solution of 0.314M KOH is used to neutralize 10.0mL H3PO4 solution. H3PO4(aq) + 3KOH(aq) → K3PO4(aq) + 3H2O(l) If 29.3mL KOH solution is required to reach the endpoint, what is the molarity of the H3PO4 solution?

*December 3, 2013*

**chemistry**

A solution of 0.314M KOH is used to neutralize 10.0mL H3PO4 solution. H3PO4(aq) + 3KOH(aq) → K3PO4(aq) + 3H2O(l) If 29.3mL KOH solution is required to reach the endpoint, what is the molarity of the H3PO4 solution?

*December 3, 2013*

**chemistry**

I have a balance equation but i need to know how to find the different states of each element. How do I do that? Ca + 2 HNO3 => Ca(NO3)2 + H2

*December 2, 2013*

**math/ algebra 1**

ok thank you :D

*November 10, 2013*

**math/ algebra 1**

right

*November 10, 2013*

**math/ algebra 1**

x>15

*November 10, 2013*

**math/ algebra 1**

can someone please help me explain how they got this answer and can someone please show me the steps into solving this question? Q: Four more than the quotient of a number and three is at least nine.

*November 10, 2013*

**chemistry**

hello i am having trouble writing these two ionic equations. could someone explain to me how to do that? 1.)K2SO4(aq) and Na2CO3(aq).Write the ionic equation. 2.)RbCl(aq) and KOH(aq).Write the ionic equation.

*November 4, 2013*

**chemistry**

When I solved the equation I got 3.1 grams of NO2. That isn't the correct answer. What did I do wrong?

*October 26, 2013*

**chemistry**

In the formation of smog, nitrogen and oxygen gas react to form nitrogen dioxide: N2(g)+2O2(g)→2NO2(g)How many grams of NO2 will be produced when 2.1L of nitrogen at 840mmHg and 28∘C are completely reacted? I know that you use the equation n=PV/RT to get the number...

*October 26, 2013*

**Chemistry**

How are we suppose to solve for the molar mass because we don't have the chemical formula for the gas?

*October 24, 2013*

**chemistry**

thanks for your help

*October 24, 2013*

**chemistry**

When I've done the equation I've gotten 713.971 K for the first part. What have I done wrong?

*October 24, 2013*

**chemistry**

A 0.286g sample of carbon dioxide, CO2, has a volume of 585mL and a pressure of 495mmHg . What is the temperature, in kelvins and degrees Celsius, of the gas?

*October 24, 2013*

**Science**

I need help with this...

*October 15, 2013*

**Math**

The temperature at 6,000 m altitude is 11 degrees Celsius. At 4,000 m, the temperature is at 2 degrees Celsius. How much colder is it at 6,000 m than at 4,000 m? What is the difference in temperature?

*September 12, 2013*

**science**

An insect inside a bus flies from the back toward the front at 2 m/a. The bus is moving in a straight line at 2m/a. What is the speed of the insect?

*September 7, 2013*

**maths**

the equation for the motion of an object with constant acceleration is d=vt+0.5at^2where d is the distance travelled in ft, v is the starting velocity in ft/s a is the acceleration in ft/s^2 and t is time in seconds a race car begins with a velocity of 200ft/s and accelerates ...

*August 16, 2013*

**Biology**

Trust me this is Biology not Chemistry. In Biology it's the lesson The Building Blocks of Life. Thank you guys I wanted to review my answers.

*August 15, 2013*

**human services**

• Can we have client advocacy, a forum for conflict resolution, and agents for policy change without competing for limited dollars and resources? Why? What do you see as the most vital function?

*August 7, 2013*

**math**

Thank you!!!

*May 12, 2013*

**math**

a fair coin is tossed in the air 4 times. if the coin lands heads up the first three tosses, what is the probability the coin will land heads up the fourth toss? I think it is 1/2 because the coin has 2 sides and 50% it will land on heads. My friend thinks it is 1/16, since ...

*May 12, 2013*

**math**

Which two rectangles have an area of 72 square centimeters? A. length 12 cm, width 6 cm B. length 20 cm, width 16 cm C. length 9 cm, width 8 cm D. length 8 cm, width 7 cm

*May 7, 2013*

**Physics**

((.2)^2)/(4(pi^2))=.0010132118 .0010132118x9.8 0.00992948m

*April 7, 2013*

**math**

ok thank you for explaining that.

*March 29, 2013*

**math**

Tina solved for the decimal value 0f (3/5*18) and got an answer of 5.4. Four of her classmates argued that her answer was not reasonable. Which of the following statements best explain why that value can not =5.4 A. the number 18 is a multiple of 3 , so the answer must be a ...

*March 29, 2013*

**math**

Thank you, I wasn't thinking the distance, I was thinking the actual numbers of -4 and 5, you helped me see how this is done. Thanks a lot

*March 29, 2013*

**math**

a number line below -5 -4 -3 -2 -1 0 1 2 3 4 5 Which of the expressions below represent the distance between -4 and 5 on the number line? [ ]= absolute value symbol A. [-4+5] B.[4-5] C.[-4-5] d.[-5-(-4)] I believe it is D, since the absolute value of a neg. number is positive...

*March 29, 2013*

**math- please help**

Thank you so much for your help.

*March 28, 2013*

**math- please help**

How do you figure this out? I don't know how to do it? Can you please explain how you would get b? Did you just divide each side by m? Thank you for your help

*March 28, 2013*

**math- please help**

This helped alittle but the answers were multiple choice a. c B. 60 C. m D .m/c That is why I thought the best answer was c. = m Is this correct?

*March 28, 2013*

**math- please help**

a copy machine makes c copies in m minutes according to the equation c=60m. what is the unit rate of copies per minute? I think it is m but not sure, can you help me understand how to figure out this equation. Please help! Thanks

*March 28, 2013*

**math**

a copy machine makes c copies in m minutes according to the equation c=60m. what is the unit rate of copies per minute? I think it is m but not sure, can you help me understand how to figure out this equation. Thanks

*March 28, 2013*

**Math**

a park is 3/4 mile long and 1/2mile wide. Which fraction represents the ratio of the parks length to its width? I did it by 3/4 divided by 1/2 this equals 1 1/2 or 3/2 Is this correct?

*March 28, 2013*

**Math**

I see what you did, but I thought TT was always done last, so I added and then multiplied TT. Is there an order of operation for Pi?

*March 16, 2013*

**Math**

1st I added 16 plus 64=80. Then I multiplied 80 by TT and got 251.3 The last part should be 251.3 I messed up on the last number. so is 251.3 correct? Thank you for checking my work, I appreciate it.

*March 16, 2013*

**Math**

The heart shaped card is made by placing a square card and two semicircles together. What is the area of the card. each side of the sqare is 8cm long. I did a=TTr(squared)+lw A=TT4squared+8(8) A=TT16+64 A=80TT A+251.3274123 A=251.3 cm(squared) The total area of the card is 257...

*March 16, 2013*

**chemistry**

The solid oxide of generic metal M is added to 75 mL of water and reacts to produce a basic solution that is 0.20 M in the resulting compound. Neutralization of the solution required titration with 27 mL of 0.56 M HCl. How many valence electrons must M have?

*March 2, 2013*

**Algebra**

Meh is 6/6 100% correct! Thank you I was reviewing.

*February 21, 2013*

**Chemistry. Please help!**

Fe3+ + I1- ¨ Fe2+ + I2 1. Balance the equation 2. Which element is being oxidized? 3. Which element is the reducing agent?

*February 20, 2013*

**Physics**

If a pendulum-driven clock gains 5.00 s/day, what fractional change in pendulum length must be made for it to keep perfect time? Please provide explanations and solutions. Thanks in advance :D

*February 4, 2013*

**Physics**

At what rate will a pendulum clock run on the Moon, where the acceleration due to gravity is 1.63 m/s2 , if it keeps time accurately on Earth? That is, find the time (in hours) it takes the clock’s hour hand to make one revolution on the Moon. provide solutions and ...

*February 4, 2013*

**Physics**

A 2.0kg block hang from a vertical spring causes it to stretch by 200cm. If the 2.0kg block is replaced by a 0.50kg mass and the spring is stretched and released, what are the frequency and period of the oscillations? Please help and provide solutions and explanations. Thank ...

*January 22, 2013*

**Math**

Rae is 100% correct. I just took the test and came here to check my answers and she was there for me. Thanks Rae!

*January 16, 2013*

**physics**

110 N

*November 25, 2012*

**Math**

during a match, pat kicks a football onto the roof of the stand. The stand and the path of the ball are at righ angles to each other. The path of the ball is given by y=2.5x-x^2÷15 The roof of the stand is given by y=x÷2+48 ÷5, where 18</=x</=40. All...

*November 13, 2012*

**Physics**

Im not sure what equations to use other than the equation for potential energy or the equation for work. That is about as far as I have come to solving the problem.

*September 21, 2012*

**Physics**

A crane is lifting a 500kg payload straight up at a constant speed of 0.7ms-1. (a)What is the power output of the crane. (ignoring losses)? (b)If it takes the cran2 2 minutes to raise the payload to its final height, how far above the ground is this? (c)If the cable were to ...

*September 21, 2012*

**Physics**

During a car crash a 65kg person's head goes from traveling at 50km h-1 to stationary in 0.15s. (a)What is the magnitude of the average net force acting on the head of a person with a 4.5kg head? (b)How does this compare with the weight force acting on the person?

*September 21, 2012*

**Physics**

The Earth has a mass of 5.97 x10^24 kg and the Moon has a mass of 7.36 x10^22kg. The average distance between the center of the Earth and the center of the moon is 3.84 x10^8m. (a) How far away would the Moon need to be for the magnitude of the gravitational force acting on it...

*September 21, 2012*

**Physics**

An 8g bullet leaves a gun at 700ms-1. (a) what is the maximum height that this bullet could reach (ignoring air resistance)

*September 21, 2012*

**Physics**

An 8g bullet leaves a gun at 700ms-1. (a) what is the maximum height that this bullet could reach (ignoring air resistance)

*September 21, 2012*

**Physics**

Two 30kg children in a 20 kg cart are stationary at the top of a hill. They start rolling down the 80m tall hill and they are traveling at 30 km h-1 when they reach the bottom. (The cart had brakes!) How much work was done on the cart by friction during its travel down the ...

*September 21, 2012*

**health**

I would say sedentary lifestyle, diet, smoking, drinking, genetics are all challenges to over coming health and wellness. To overcome these you must change your habits, your lifestyle, the food that you eat and the amount of exercise that you do. This is a short version but ...

*September 21, 2012*

**Math**

What is the value of x when the line crosses the x-axis?

*September 11, 2012*

**Math**

The length of the shortest piece is 4.2ft.

*September 11, 2012*

**math**

I am in Connections 8th grade too. Were the answers correct?

*September 6, 2012*

**Religion**

i need to write an essay about if anne frank's life is relevant to teenager's today. Please hele me!!

*June 24, 2012*

**English/History**

In Maus, what 3 times does Vladek almost die, but is saved? I feel like there are a ton of times he could have dies (being in the concentration camps alone is life-threatening enough), but I'm not sure what specific times Vladek was really close to death, but was saved? If...

*May 20, 2012*

**science**

Can someone please help me with this question? please.

*May 19, 2012*

**science**

John folded a wet washcloth in four. Mary spreads hers out. Which washcloth dried the quickest???And please explain.

*May 19, 2012*

**World History**

For a project I'm doing for world history, I have to include 2 "VIP's" for Winston Churchill. Does anyone know of a person who contributed to Churchill's fame or someone who was important to Churchill that I could research to include as one of my VIP'...

*April 11, 2012*

**Science**

help me!!!!

*April 10, 2012*